package com.webserver.http;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * 保存所有和HTTP协议有关的定义
 */
public class HttpContext {
    /*
    资源后缀与Content-Type头的对应关系
    key：资源后缀名    value：Content-Type的对应的值
     */
    private static Map<String,String> mimeMapping=new HashMap<>();
    static {
        initMimeMapping();//初始化mimeMapping
    }
    private static void initMimeMapping(){
        SAXReader reader=new SAXReader();
        try {
            Document doc=reader.read("./config/web.xml");
            Element root=doc.getRootElement();
            List<Element> list=root.elements("mime-mapping");
            for (Element mimeEle:list){
                String key=mimeEle.elementText("extension");
                String value=mimeEle.elementText("mime-type");
                //System.out.println(key+","+value);
                mimeMapping.put(key,value);
            }




        } catch (DocumentException e) {
            e.printStackTrace();
        }
    }


    /**
     * 根据资源后缀获取对应的Content-Type值
     * @param ext
     * @return
     */
    public static String getMimeType(String ext){
        return mimeMapping .get(ext);
    }
}
